EP0709872A2 - Farbkathodenstrahlröhre - Google Patents

Farbkathodenstrahlröhre Download PDF

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Publication number
EP0709872A2
EP0709872A2 EP95116896A EP95116896A EP0709872A2 EP 0709872 A2 EP0709872 A2 EP 0709872A2 EP 95116896 A EP95116896 A EP 95116896A EP 95116896 A EP95116896 A EP 95116896A EP 0709872 A2 EP0709872 A2 EP 0709872A2
Authority
EP
European Patent Office
Prior art keywords
shadow mask
frame
ray tube
cathode ray
color cathode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95116896A
Other languages
English (en)
French (fr)
Other versions
EP0709872A3 (de
EP0709872B1 (de
Inventor
Hideaki Maki
Jun Araya
Mayumi Ishibashi
Takami Okamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP26508194A external-priority patent/JPH08129961A/ja
Priority claimed from JP26700794A external-priority patent/JP3269744B2/ja
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to EP97106464A priority Critical patent/EP0788133B1/de
Publication of EP0709872A2 publication Critical patent/EP0709872A2/de
Publication of EP0709872A3 publication Critical patent/EP0709872A3/de
Application granted granted Critical
Publication of EP0709872B1 publication Critical patent/EP0709872B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0722—Frame

Definitions

  • This invention relates to a cathode ray tube apparatus, and especially relates to a cathode ray apparatus having a shadow mask which is fixed on a frame under a condition that a predetermined tension is applied to the shadow mask.
  • a flat type color cathode ray tube apparatus In a flat type color cathode ray tube apparatus, about 80 % of electron beams which are emitted from electron guns collide with a shadow mask. The shadow mask is heated by the collision of the electron beams, and it is deformed by thermal expansion. In order to prevent the reduction of the quality of picture images displayed on a screen of the cathode ray tube apparatus caused by the deformation of the shadow mask, the shadow mask has been fixed on a frame under a condition that a predetermined tension is applied to the shadow mask in the conventional color cathode ray tube apparatus.
  • the frame of the conventional color cathode ray tube apparatus is integrally formed from a plate by press working in order to make a cross-sectional shape of each side substantially L-shaped.
  • the frame is formed by welding of four angle bars having a substantially L-shaped cross-section in order to make each angle between the sides be substantially right angle. Therefore, an electron beam through hole on the frame is formed as a substantially rectangular shape.
  • the manufacturing process of the frame can be made simple and the cost of the frame can be reduced.
  • the frame when the rigidity of the frame is not sufficient, the frame will be deformed by the tension applied to the shadow mask. Thereby, the surface of the shadow mask corrugates. Furthermore, the relative positions of electron beam through holes on the shadow mask against phosphor regions on the screen are discrepant. Thus, the mislanding occurs on the color cathode ray tube apparatus.
  • the cross-sectional shape of each side of the frame is made to be substantially triangular for increasing the rigidity of the frame.
  • the tension should be larger to cancel the thermal expansion of the shadow mask sufficiently, for preventing the mislanding due to the thermal expansion of the shadow mask, when the shadow mask is heated by the irradiation of the electron beams during operation of the color cathode ray tube apparatus. Therefore, the frame is made of a material having a larger thermal expansion coefficient than that of the material of the shadow mask, which is, for example, shown Publication Gazette of Unexamined Japanese Patent Application Hei 2-204943.
  • the aspect ratio is, for example, 3:4 or 9:16, so that the screen or the frame is horizontally oblong.
  • each side member of the frame is formed by bending a plate to provide a substantially triangular cross-section or formed by cutting a bar having a substantially triangular cross-section, and the side members are welded at four corners of the frame.
  • the frame has disadvantages in that the weight of the frame becomes heavier and the working process of the frame become complex, and the cost for manufacturing the frame becomes expensive.
  • the tension applied to the shadow mask will be uneven in the vicinity of the cuttings.
  • the corrugation occurs in those parts, and the corrugation becomes the cause of the mislanding of the picture image displayed on the screen of the color cathode ray tube apparatus.
  • a temperature of the shadow mask in a normal actuation of the color cathode ray tube apparatus is about 100 degrees Celsius.
  • the highest temperature of the shadow mask in the heat treatment is about 450 degrees Celsius.
  • the frame is made of the material having larger thermal expansion coefficient than that of the material of the shadow mask for preventing the reduction of the tension applied to the shadow mask.
  • the temperature of the shadow mask and the frame in the heat treatment in the manufacturing process becomes about five times as large as the temperature in the normal operation of the cathode ray tube apparatus, the difference between the thermal expansion of the shadow mask and the thermal expansion of the frame is magnified.
  • the tension applied to the shadow mask will be larger that that in the normal actuation of the color cathode ray tube apparatus or the ordinary temperature.
  • the plastic deformation occurs in the shadow mask.
  • the tension applied to the shadow mask in which the plastic deformation occurs will be reduced at the ordinary temperature, and the mislanding will occur during operation of the color cathode ray tube apparatus.
  • a first embodiment of a color cathode ray tube apparatus of this invention comprises a funnel, a panel, a phosphor screen disposed inside of the panel, a shadow mask disposed in the vicinity of the phosphor screen, a frame on which the shadow mask is fixed and an electron gun disposed in a neck part of the funnel.
  • the frame has a shadow mask welding face which has a substantially rectangular shape, side walls which are continuously formed along an inner periphery of the shadow mask welding face and are substantially perpendicular to the shadow mask welding face and a flange face which is formed along the side walls and is substantially parallel to the shadow mask welding face.
  • the shadow mask is fixed on the shadow mask welding face of the frame by welding under a condition that a predetermined tension is applied to the shadow mask.
  • the mechanical strength of the longer sides of the frame is higher than that of the shorter sides of the frame.
  • reinforcing members are provided on respective longer sides of the frame.
  • reinforcing members are provided on respective longer sides and shorter sides of the frame, and at least one of shape, thickness, number and material of the reinforcing members provided on the longer sides is different from that of the reinforcing members provided on the shorter sides.
  • the reinforcing member is a rectangular plate which is fixed on the flange face of the frame.
  • the reinforcing member is a rectangular plate which is obliquely fixed between the side wall and the flange face of the frame.
  • the reinforcing member is a substantially triangular shaped plate which is fixed between the side wall and the flange face and substantially perpendicular to the shadow mask welding face.
  • a width of at least a part of the flange face on each longer side of the frame is wider than a width of the flange face on each shorter side of the frame.
  • the side wall on each longer side of the frame swells outward on a plane parallel to the shadow mask welding face.
  • at least a part of the flange face on each shorter side of the frame is cut out.
  • a height of at least a part of side wall on each shorter side of the frame is lower than that of the side wall on each longer side.
  • the longer sides and the shorter sides of the frame are respectively formed as independent members, and a thickness of a first member for the longer side is larger than that of a second member for the shorter side.
  • the longer sides and the shorter sides of the frame are respectively formed as independent members, and a material of a first member for the longer side is different from that of a second member for the shorter side.
  • a thermal expansion coefficient of a material of the frame is smaller than that of a material of the shadow mask.
  • a second embodiment of a color cathode ray tube apparatus of this invention comprises a funnel, a panel, a phosphor screen disposed inside of the panel, a shadow mask disposed in the vicinity of the phosphor screen, a frame on which the shadow mask is fixed and an electron gun disposed in a neck part of the funnel.
  • the frame has a shadow mask welding face in which four sides thereof are continuously formed as substantially rectangular shape and side walls which are continuously formed along an inner periphery of the shadow mask welding face, and has alternately formed perpendicular portions and slanted portions, and a flange face which is formed along the side walls and is substantially parallel to the shadow mask welding face.
  • the perpendicular portions are substantially perpendicular to the shadow mask welding face and the slanted portions are formed to be slanted to the inside of the frame.
  • the shadow mask is fixed on the shadow mask welding face of the frame by welding under a condition that a predetermined tension is applied to the shadow mask.
  • the slanted portions of the side walls of the frame serve as ribs, so that the rigidity of the frame against the tension applied to the shadow mask can be made higher without increasing the weight.
  • the deformation of the frame by the tension applied to the shadow mask can be prevented.
  • respective sides of the shadow mask welding face are continued and no cuttings are formed at the corners, so that the tension applied to the shadow mask may not be uneven in the vicinity of the corners. No corrugation occurs in the vicinity of the corners.
  • the ridge lines of the slanted portions of the side walls are substantially parallel to the sides of the shadow mask welding face, and the slanted portion forms an opening having a substantially triangular shape on a plane perpendicular to the shadow mask welding face with the perpendicular portion of the side wall and the flange face.
  • the frame can be formed by press working.
  • the mechanical strength of the frame can be made entirely even on respective sides.
  • a third embodiment of a color cathode ray tube apparatus of this invention comprises a funnel, a panel, a phosphor screen disposed inside of the panel, a shadow mask disposed in the vicinity of the phosphor screen, a frame on which the shadow mask is fixed and an electron gun disposed in a neck part of the funnel.
  • the frame has a shadow mask welding face in which four sides thereof are continuously formed as substantially rectangular in shape and side walls which are continuously formed along an inner periphery of the shadow mask welding face, and has alternately formed perpendicular portions and first and second slanted portions, and a flange face which is formed along the side walls and is substantially parallel to the shadow mask welding face.
  • the perpendicular portions are substantially perpendicular to the shadow mask welding face and the first slanted portions are formed to be slanted to the inside of the frame, and the second slanted portions are formed to be slanted to the outside of the frame.
  • the shadow mask is fixed on the shadow mask welding face of the frame by welding under a condition that a predetermined tension is applied to the shadow mask.
  • the ridge lines of the side walls and the shadow mask welding face are straight lines, and the ridge lines of the side walls and the flange face are wave lines.
  • a cross-sectional shape of the side walls of the frame in the vicinity of the boundary between the shadow mask welding face and the side walls on a plane parallel to the shadow mask welding face is substantially octagonal.
  • the frame is integrally formed by press working. By such a configuration, a gap is formed between the side walls and the shadow mask welding face in the vicinity of each corner of the frame.
  • the shape of each corner of the shadow mask welding face can be made stable in the press working, and the flatness of the shadow mask welding face can be maintained.
  • the thermal expansion coefficient of the material of the frame is smaller than that of the material of the shadow mask.
  • a fourth embodiment of a color cathode ray tube apparatus of this invention comprises a funnel, a panel, a phosphor screen disposed inside of the panel, a shadow mask disposed in the vicinity of the phosphor screen, a frame on which the shadow mask is fixed and an electron gun disposed in a neck part of the funnel, and wherein the shadow mask is fixed on the frame under a condition that a predetermined tension is applied to the shadow mask.
  • the frame is made of a material having a thermal expansion coefficient smaller than that of a material of the shadow mask.
  • the thermal expansion coefficient of the material of the frame is ⁇ F (1/°C )
  • the temperature rise of the shadow mask in the actuation of the color cathode ray tube apparatus is ⁇ t o (°C )
  • the thermal expansion coefficient of the material of the shadow mask is ⁇ M (1/°C )
  • Young' modulus of the material of the shadow mask at the normal temperature is E M (kg/mm2)
  • the tension applied to the shadow mask is T (kg/mm2)
  • the shadow mask temporarily reduces the tension at a high temperature by the expansion.
  • the plastic deformation may not occur on the shadow mask.
  • the shadow mask is contracted, so that the tension applied to the shadow mask recovers.
  • the tension by which the thermal expansion of the shadow mask by the irradiation of the electron beams in the normal actuation of the color cathode ray tube apparatus can be cancelled or absorbed, remains after the heat treatment.
  • the first embodiment of the color cathode ray tube apparatus of this invention comprises a funnel 1 made of glass, a panel 2 made of glass, a phosphor screen 8 disposed inside of the panel 2, a shadow mask 3 disposed in the vicinity of the phosphor screen 8, a frame 4 for supporting the shadow mask 3, and an electron gun 6 disposed in a neck part of the funnel 1.
  • the shadow mask 3 is fixed on the frame 4 by resistance welding, laser welding working, and the like under a condition that a predetermined tension of about 10 Kg/mm2 is applied to the shadow mask 3.
  • the longer sides of the frame are about 333 mm, and the shorter sides are about 256 mm.
  • the cross-sectional shapes of the respective sides are substantially L-shaped.
  • Electron beams which correspond to red, green and blue colors and are radiated from the electron gun 6, pass through predetermined electron beam through holes formed on the shadow mask and reach predetermined phosphor regions of the phosphor screen 8 corresponding to the colors of the electron beams.
  • Each phosphor region which is irradiated by the electron beam, luminates the color of red, green or blue corresponding to the electron beam.
  • a color picture image can be displayed on the screen of the panel 2 of the color cathode ray tube apparatus.
  • the frame 4 has a substantially rectangular shape viewed on a plane parallel to the shadow mask 3.
  • a shadow mask welding face 41 which is parallel to the shadow mask 3, is formed at an open end of the frame 4.
  • Flange faces 43a and 43b, which are parallel to the shadow mask welding face 41, are formed at the other open end of the frame 4.
  • Side walls 42a and 42b are integrally formed along the inner peripheries of longer sides 41a and shorter sides 41b of the shadow mask welding face 41.
  • the side walls 42a and 42b and the flange faces 43a and 43b are respectively formed integrally.
  • Reinforcing plates 44 are respectively fixed on the flange faces 43a on the longer sides.
  • the frame 4 shown in FIG.2 can be obtained by fixing the reinforcing plates 44 by spot welding and the like on a frame which is conventionally used and is integrally formed by press working.
  • a frame in which the mechanical strength of the longer sides is higher than that of the shorter sides, can easily be obtained.
  • substantially rectangular plates 45 which are obliquely fixed between the side walls 42a and the flange faces 43a on the longer sides, can be used as reinforcing plates. Thereby, the mechanical strength of the longer sides can be made higher than that of the shorter sides.
  • substantially triangle plates 46 which are fixed between the side walls 42a and the flanges 43a on the longer sides at a predetermined intervals and oriented to be perpendicular to the shadow mask 3, can be used as reinforcing plates.
  • the mechanical strength of the longer sides similarly can be made higher than that of the shorter sides.
  • the length of the longer sides (41a, 42a, 43a) of the frame 4 will be called L1
  • Young's modulus of the shadow mask 3 along the shorter sides E2 a tension applied to the shadow mask 3 in a direction parallel to the longer sides T1
  • iron was used as a material of the shadow mask 3.
  • the frame 4 and the shadow mask 3 were exposed to a high temperature at the circumference for a long time.
  • the thermal expansion of the frame 4 was smaller than that of the shadow mask 3.
  • the material of the shadow mask did not surpass the elastic limit, and no plastic deformation has occurred in the shadow mask 3.
  • the mechanical strength of the longer sides of the frame 4 could be made higher than that of the shorter sides of the frame 4.
  • the quantity of the deformation of the longer sides of the frame 4 could be made smaller.
  • quantities of the deformation of the longer sides and the shorter sides of the frame 4 could be made the same as those of the shadow mask 3.
  • the thermal expansion of the shadow mask 3 could be cancelled or absorbed by the tension applied to the shadow mask 3.
  • the relative position of each electron beam through hole on the shadow mask 3 could coincide with the position of the phosphor region corresponding to the electron beam through hole. The mislanding of the picture image displayed on the screen was not observed.
  • the reinforcing plates 44, 45 or 46 are provided only on the longer sides of the frame 4.
  • the reinforcing member it is possible to provide the reinforcing member on not only the longer sides but also the shorter sides of the frame 4.
  • at least one of the shape, thickness, number and material of the reinforcing member on the longer sides is different from that of the reinforcing member on the shorter sides.
  • the mechanical strength of the longer sides of the frame 4 can be higher than that of the shorter sides.
  • the reinforcing plates 44, 45 or 46 are used in combination with other kinds of the reinforcing plates in the remainder. The same effects can be obtained in the latter case.
  • FIGs. 5 to 8 A second embodiment of a color cathode ray tube apparatus of this invention is described referring to FIGs. 5 to 8.
  • the configuration of the second embodiment of the color cathode ray tube apparatus of this invention is substantially the same as that of the first embodiment shown in FIG.1. However, only the shape of the frame 4 in the second embodiment is different from that in the first embodiment. Thus, the explanation of the duplicated configuration of the color cathode ray tube apparatus is omitted.
  • the frame 4 has a substantially rectangular shape on a plane parallel to the shadow mask 3 (not shown in FIG.5).
  • a shadow mask welding face 41 which is parallel to the shadow mask 3, is formed at an open end of the frame 4.
  • Flange faces 43a and 43b, which are parallel to the shadow mask welding face 41, are formed at the other open end of the frame 4.
  • Side walls 42a and 42b are integrally formed along inner peripheries of longer sides 41a and shorter sides 41b of the shadow mask welding face 41.
  • the side walls 42a and 42b and the flange faces 43a and 43b are respectively formed integrally.
  • a width W1 of the flange face 43a on the longer sides is wider than a width W2 of the flange face 43b on the shorter sides.
  • the side walls 42a on the longer sides are protruded outwardly.
  • the width W1 of the flange face 43a on the longer sides can be partially wider than the width w2 of the flange face 43b on the shorter sides.
  • the width W1 of the flange face 43a on the longer sides can be relatively wider than the width w2 of the flange face 43b on the shorter sides.
  • the width W1 of at least a part of the flange face 43a on the longer sides of the frame is made wider than the width W2 of the flange face 43b on the shorter sides, a frame in which the mechanical strength of the longer sides is higher than that of the shorter sides can be obtained.
  • the height H2 of at least a part of the side walls 42b on the shorter sides of the frame 4 is smaller than the height H1 of the side walls 41a on the longer sides.
  • the frame 4 can be formed integrally by press working, so that the configuration of the frame 4 is suitable for mass production.
  • each feature of the second embodiment shown in one of FIGs. 5 to 8 can be applied in combination with other features in the remainder. Thereby, a frame in which the mechanical strength of the longer side is higher than that of the shorter sides can be obtained. Still furthermore, it is possible that each feature of the second embodiment can be combined with at least one feature of the first embodiment shown in FIGs. 2 to 4.
  • FIGs. 9 and 10 The configuration of the third embodiment of the color cathode ray tube apparatus of this invention is substantially the same as that of the first embodiment shown in FIG.1. However, only the shape of the frame 4 in the third embodiment is different from that in the first embodiment. Thus, the explanation of the duplicated configuration of the color cathode ray tube apparatus is omitted.
  • the longer sides and the shorter sides of the frame 4 are respectively formed as independent members 4a and 4b.
  • the thickness of the longer side member 4a is larger than that of the shorter side member 4b. Since the material of the longer side member 4a is essentially the same as that of the shorter side member 4b, the frame 4 can be assembled by welding. By such a configuration, a frame in which the mechanical strength of the longer side is higher than that of the shorter sides can be obtained.
  • the material of the longer side member 4a is different from that of the shorter side member 4b. In this case, a material having Young's modulus larger than that of the material of the shorter side member 4a can be used as the material of the longer side member 4a.
  • the thickness and the cross-sectional shape of the longer side member 4a can be made the same as those of the shorter side member 4b.
  • a special jig for adjusting the difference between the thickness of the longer side member 4a and the thickness of the shorter side member 4b is necessary.
  • the special jig for adjusting the difference between the thicknesses is not necessary.
  • the difficulty of the welding due to the difference of the materials of the longer side member 4a and the shorter side member 4b in the latter case can be reduced.
  • an alloy including aluminum and stainless steel or normal steel, and stainless steels having different components can be used as the combination of the materials of the longer side member 4a and the shorter side member 4b.
  • the third embodiment is suitable for a production of small quantity.
  • FIG. 11 a fourth embodiment of a color cathode ray tube apparatus of this invention is described referring to FIGs. 11 and 12.
  • the configuration of the fourth embodiment of the color cathode ray tube apparatus is substantially the same as that of the first embodiment shown in FIG.1 except the shape of the frame 4.
  • the detailed explanation of the configuration of the fourth embodiment of the color cathode ray tube apparatus is omitted.
  • the frame 4 has a substantially rectangular in cross-section viewed on a plane parallel to the shadow mask 3 (not shown in FIG.12).
  • a shadow mask welding face 41 which is parallel to the shadow mask 3 and on which the shadow mask 3 is to be welded, is formed at an open end of the frame 4.
  • a flange face 43 which is parallel to the shadow mask 3, is formed at the other open end of the frame 4.
  • the shadow mask welding face 41 is a substantially rectangular shape, in which respective longer sides 41a and shorter sides 41b are integrally formed. No cutting is formed at each corner.
  • Side walls 42 are integrally formed along inner peripheries of the sides 41a and 41b of the shadow mask welding face 41.
  • Perpendicular portions 142a which are perpendicular to the shadow mask welding face 41 and slanted portions 142b which are slanted inside of the frame 4 are alternately formed on the side walls 42. Furthermore, the side walls 42 and the flange face 43 are integrally formed.
  • the frame shown in FIG.12 is formed integrally by press working.
  • the ridge lines at the top of the slanted portions 142b on the side walls 42 are substantially parallel to the sides 41a or 41b of the shadow mask welding face 41.
  • a substantially triangular opening 142d is formed by the perpendicular portion 142a and the slanted portion 142b of the side walls 42 and the flange face 43.
  • the cross-sectional shape of the side walls 42 on a plane parallel to and in the vicinity of the shadow mask welding face 41 is substantially octagonal.
  • each corner 41c of the shadow mask welding face 41 can be formed between each corner 41c of the shadow mask welding face 41 and the side walls 42.
  • the shape of each corner 41c of the shadow mask welding face 41 can be stable in the press working, and the flatness of the shadow mask welding face 41 can be maintained.
  • At least one of dimension and number of the perpendicular portions 142a and the slanted portions 142b is varied.
  • the width of the perpendicular portions 142a and the number of the slanted portions 142b are varied.
  • the slanted portions 142b which are formed on the side walls 42 and slanted to the inside of the frame 4 serve as ribs.
  • the rigidity of the frame 4 against the tension applied to the shadow mask 3 can be made higher, without increasing the weight of the frame 4.
  • the deformation of the frame 4 due to the tension applied to the shadow mask 3 can be prevented.
  • the longer side 41a and the shorter side 41b are continuously formed at each corner of the shadow mask welding face 41, and no cutting is formed at the corner of the shadow mask welding face 41.
  • the tension applied to the shadow mask 3 may not be uneven in the vicinity of the corners of the shadow mask welding face 41, so that no corrugation occurs in the vicinity of the corners.
  • FIGs. 13, 14(a), 14(b) and 14(c) The configuration of the fifth embodiment of the color cathode ray tube apparatus is substantially the same as the configuration of the first or fourth embodiments shown in FIG. 1 or 11, except for the shape of the frame 4. Thus, the duplicating configuration of the fifth embodiment of the color cathode ray tube apparatus is omitted.
  • the frame 4 in the fifth embodiment is substantially rectangular in cross-section viewed on a plane parallel to the shadow mask 3 (not shown in FIG.13).
  • a shadow mask welding face 41 which is parallel to the shadow mask 3 and on which the shadow mask 3 is to be welded, is formed at an open end of the frame 4.
  • a flange face 43 which is parallel to the shadow mask 3, is formed at the other open end of the frame 4.
  • the shadow mask welding face 41 is of substantially rectangular shape, in which respective longer sides 41a and shorter sides 41b are integrally formed. No cutting is formed at each corner.
  • Side walls 145 are integrally formed along inner peripheries of the sides 41a and 41b of the shadow mask welding face 41.
  • the side walls 145 are formed by alternation of a first slanted portion 45a shown in FIG.14(a), a slanted portion 45b shown in FIG.14(b) and a second slanted portion 45c shown in FIG.14(c).
  • the first slanted portion 45a is slanted to the inside of the frame 4 along line A-A in FIG.13.
  • the perpendicular portion 45b is perpendicular to the shadow mask welding face 41 along line B-B in FIG.13.
  • the second slanted portion 45c is slanted to the outside of the frame 4 along line C-C in FIG.13.
  • the side walls 42 and the flange face 43 are integrally formed.
  • the ridge lines between the shadow mask welding face 41 and the side walls 145 are respectively straight lines.
  • the ridge lines between the flange face 43 and the side walls 145 are wave forms.
  • the cross-sectional shape of the side walls 145 on a plane parallel to and in the vicinity of the shadow mask welding face 41 is substantially octagonal.
  • a gap 41d can be formed between each corner 41c of the shadow mask welding face 41 and the side walls 145.
  • the shape of each corner 41c of the shadow mask welding face 41 can be stable in the press working, and the flatness of the shadow mask welding face 41 can be maintained.
  • the first and the second slanted portions 45a and 45c which are formed on the side walls 145 of the frame 4, serve as ribs.
  • the rigidity of the frame 4 against the tension applied to the shadow mask 3 can be made higher, without increasing the weight of the frame 4.
  • the deformation of the frame 4 due to the tension applied to the shadow mask 3 can be prevented.
  • the longer side 41a and the shorter side 41b are continuously formed at each corner of the shadow mask welding face 41, and no cutting is formed at the corner of the shadow mask welding face 41.
  • the tension applied to the shadow mask 3 may not be uneven in the vicinity of the corners of the shadow mask welding face 41, so that no corrugation occurs in the vicinity of the corners.
  • the shadow mask 3 As a material of the shadow mask 3, iron was used.
  • the funnel 1 and the panel 2 were connected, the frame 4 and the shadow mask 3 were exposed to a high temperature at the circumference for a long time.
  • the thermal expansion of the frame 4 was smaller than that of the shadow mask 3.
  • the material of the shadow mask did not surpass the elastic limit, and no plastic deformation occurred in the shadow mask 3.
  • FIGs. 15 to 18 The configuration of the sixth embodiment of the color cathode ray tube apparatus is substantially the same as the configuration of the first or fourth embodiments shown in FIG. 1 or 11, except for the shape of the frame 4. Thus, the duplicating configuration of the fifth embodiment of the color cathode ray tube apparatus is omitted.
  • a shadow mask 3 which is made of an iron and has electron beam through holes arranged in a pitch of about 0.26 mm, is fixed on a frame 4 with a tension for cancelling or absorbing thermal expansion of the shadow mask 3 during normal operation of the color cathode ray tube apparatus.
  • the frame 4 is made of an alloy containing 50%Ni and Fe.
  • a slit 41d is formed at each corner 41c of a shadow mask welding face 41 for providing an elasticity to the frame 4. Under a condition that side walls 42 of the frame 4 are warped to the inside of the frame 4, the shadow mask 3 is welded on the shadow mask welding face 41. Thereby, a predetermined tension can be applied to the shadow mask 3.
  • the thermal expansion coefficient ⁇ M is 12 ⁇ 10 ⁇ 6 (1/° C) and Young's modulus E M is 9800 kg/mm2.
  • the room temperature is 20 degrees Celsius
  • the temperature rise of the shadow mask during the normal operation of the color cathode ray tube apparatus will be about 80 degrees Celsius.
  • the tension T for cancelling or absorbing the thermal expansion of the shadow mask during the normal operation is obtained by the equation of T ⁇ ⁇ M ⁇ ⁇ t o ⁇ E M .
  • T is over 9.4 kg/mm2.
  • FIG.17 A relation between the tension applied to the shadow mask 3 and the reduction of the tension after a heat treatment is shown in FIG.17.
  • the tension applied to the shadow mask 3 was reduced by about 70 to 80 % after the heat treatment in a temperature of about 450 degree Celsius. The reason the tension applied to the shadow mask 3 was reduced was the plastic deformation of the shadow mask.
  • the tension applied to the shadow mask 3 is zero for preventing the reduction of the tension applied to the shadow mask 3 due to the heat treatment.
  • the tension applied to the shadow mask 3 in the assembly of the shadow mask assembly is 9.4 kg/mm2. Thus, it is impossible to make the tension applied to the shadow mask 3 zero.
  • a shadow mask assembly in which the tension applied to the shadow mask 3 is zero at the temperature of 450 degrees Celsius in the heat treatment and the tension cancelling the thermal expansion can be applied to the shadow mask 3 during the normal operation of the color cathode ray tube apparatus, is necessary.
  • a thermal expansion coefficient ⁇ F of the frame 4 in which the characteristic curve A of the thermal expansion of the shadow mask 3 and the characteristic curve B of the frame 4 cross at 450 degrees Celsius, is obtained from FIG.18.
  • a relation between the thermal expansion coefficient ⁇ F of the frame 4, by which the tension applied to the shadow mask 3 becomes zero at 450 degrees Celsius, and the thermal expansion coefficient ⁇ M of the shadow mask 3 is shown by the equation of ⁇ F ⁇ ⁇ M (1-( ⁇ t o / ⁇ t)).
  • the temperature rise of the shadow mask 3 during the normal operation of the color cathode ray tube apparatus is ⁇ t o (°C ) and the temperature rise of the shadow mask 3 in the heat treatment during the producing process of the color cathode ray tube apparatus is ⁇ t (°C ).
  • the thermal expansion coefficient can be decided by the above-mentioned equation.
  • the thermal expansion coefficient of the frame ⁇ F is obtained by ⁇ F ⁇ 12 ⁇ 10 ⁇ 6 ⁇ (1-(80/430)). Namely, the value of the thermal expansion coefficient of the frame 4 is to be smaller than 9.7 ⁇ 10 ⁇ 6 (1/°C ).
  • a material having a thermal expansion coefficient similar to the above-mentioned value is 50%Ni-Fe alloy.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
EP95116896A 1994-10-28 1995-10-26 Farbkathodenstrahlröhre Expired - Lifetime EP0709872B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97106464A EP0788133B1 (de) 1994-10-28 1995-10-26 Farbkathodenstrahlröhre

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP265081/94 1994-10-28
JP26508194A JPH08129961A (ja) 1994-10-28 1994-10-28 カラー陰極線管
JP26700794A JP3269744B2 (ja) 1994-10-31 1994-10-31 カラー陰極線管
JP267007/94 1994-10-31

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP97106464A Division EP0788133B1 (de) 1994-10-28 1995-10-26 Farbkathodenstrahlröhre

Publications (3)

Publication Number Publication Date
EP0709872A2 true EP0709872A2 (de) 1996-05-01
EP0709872A3 EP0709872A3 (de) 1996-07-17
EP0709872B1 EP0709872B1 (de) 1999-04-21

Family

ID=26546811

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97106464A Expired - Lifetime EP0788133B1 (de) 1994-10-28 1995-10-26 Farbkathodenstrahlröhre
EP95116896A Expired - Lifetime EP0709872B1 (de) 1994-10-28 1995-10-26 Farbkathodenstrahlröhre

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP97106464A Expired - Lifetime EP0788133B1 (de) 1994-10-28 1995-10-26 Farbkathodenstrahlröhre

Country Status (6)

Country Link
US (1) US5742116A (de)
EP (2) EP0788133B1 (de)
KR (1) KR100225819B1 (de)
CN (2) CN1113382C (de)
DE (2) DE69525851T2 (de)
MY (1) MY114682A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5932957A (en) * 1997-04-18 1999-08-03 Thomson Consumer Electronics, Inc. Cathode-ray tube having detentioning rod assembly for a tension mask frame
FR2790140A1 (fr) * 1999-02-19 2000-08-25 Imphy Ugine Precision Cadre support de masque d'ombre de tube de visualisation cathodique
WO2005010915A2 (fr) * 2003-07-18 2005-02-03 Thomson Licensing Ensemble cadre/masque pour tube a rayons cathodiques

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JPH1145664A (ja) * 1997-07-29 1999-02-16 Toshiba Corp カラー受像管
JP3468344B2 (ja) * 1998-02-26 2003-11-17 松下電器産業株式会社 カラー受像管
JP3458727B2 (ja) * 1998-10-30 2003-10-20 松下電器産業株式会社 カラー陰極線管
JP2000173488A (ja) * 1998-12-03 2000-06-23 Sony Corp 陰極線管の色選別機構
JP3175722B2 (ja) * 1999-02-10 2001-06-11 関西日本電気株式会社 カラー陰極線管
KR100298411B1 (ko) * 1999-04-15 2002-03-02 구자홍 브라운관용 프레임의 구조
US6705145B1 (en) * 1999-11-19 2004-03-16 Matsushita Electric Industrial Co., Ltd. Method of processing bent and deformed portion of metal material
EP1157404A1 (de) * 1999-12-24 2001-11-28 Koninklijke Philips Electronics N.V. Farbkathodenstrahlröhre mit spannmaske
DE60129411T2 (de) * 2000-09-29 2007-11-29 Matsushita Electric Industrial Co., Ltd., Kadoma Kathodenstrahlröhre
KR100460779B1 (ko) * 2002-03-05 2004-12-09 엘지.필립스디스플레이(주) 평면형 음극선관
US6879094B2 (en) * 2002-05-29 2005-04-12 Lg. Philips Displays Korea Co., Ltd. Mask frame for cathode ray tube
KR100624992B1 (ko) * 2004-06-26 2006-09-20 엘지.필립스 디스플레이 주식회사 음극선관
KR101834194B1 (ko) * 2016-07-13 2018-03-05 주식회사 케이피에스 텐션마스크 프레임 어셈블리의 제조 장치 및 방법
CN107354427B (zh) * 2017-09-06 2023-10-13 京东方科技集团股份有限公司 掩膜板载台和蒸镀系统

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JPH02204943A (ja) 1989-02-01 1990-08-14 Mitsubishi Electric Corp 展張型シヤドウマスク構体およびその製造方法
JPH03187132A (ja) 1989-12-15 1991-08-15 Hitachi Ltd シャドウマスク用フレーム
JPH05290754A (ja) 1992-04-09 1993-11-05 Hitachi Ltd カラー陰極線管

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DE2732306C2 (de) * 1977-07-16 1986-06-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart Rahmen für eine Schattenmaske einer Farbfernsehbildröhre
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JP3271214B2 (ja) * 1993-09-27 2002-04-02 ソニー株式会社 ブラウン管の色選別電極架張フレームとその製造方法

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JPH02204943A (ja) 1989-02-01 1990-08-14 Mitsubishi Electric Corp 展張型シヤドウマスク構体およびその製造方法
JPH03187132A (ja) 1989-12-15 1991-08-15 Hitachi Ltd シャドウマスク用フレーム
JPH05290754A (ja) 1992-04-09 1993-11-05 Hitachi Ltd カラー陰極線管

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5932957A (en) * 1997-04-18 1999-08-03 Thomson Consumer Electronics, Inc. Cathode-ray tube having detentioning rod assembly for a tension mask frame
FR2790140A1 (fr) * 1999-02-19 2000-08-25 Imphy Ugine Precision Cadre support de masque d'ombre de tube de visualisation cathodique
EP1032016A1 (de) * 1999-02-19 2000-08-30 Imphy Ugine Precision Tragrahmen für eine Schattenmaske einer Kathodenstrahlröhrenanzeige
WO2000051157A1 (fr) * 1999-02-19 2000-08-31 Imphy Ugine Precision Cadre support de masque d'ombre de tube de visualisation cathodique
US6528933B1 (en) 1999-02-19 2003-03-04 Imphy Ugine Precision Shadow mask support frame for a cathode-ray display tube
WO2005010915A2 (fr) * 2003-07-18 2005-02-03 Thomson Licensing Ensemble cadre/masque pour tube a rayons cathodiques
WO2005010915A3 (fr) * 2003-07-18 2005-09-15 Thomson Licensing Sa Ensemble cadre/masque pour tube a rayons cathodiques

Also Published As

Publication number Publication date
CN1308362A (zh) 2001-08-15
CN1113382C (zh) 2003-07-02
EP0709872A3 (de) 1996-07-17
EP0788133A1 (de) 1997-08-06
DE69509190T2 (de) 1999-11-25
KR960015668A (ko) 1996-05-22
KR100225819B1 (ko) 1999-10-15
DE69525851D1 (de) 2002-04-18
US5742116A (en) 1998-04-21
CN1131810A (zh) 1996-09-25
EP0788133B1 (de) 2002-03-13
DE69525851T2 (de) 2002-11-28
EP0709872B1 (de) 1999-04-21
MY114682A (en) 2002-12-31
DE69509190D1 (de) 1999-05-27

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